Expressions of heat removal factor, efficient factor and time constant of the four types of cavity receiver have been deduced and test for trough solar collector system has been set up.

推导出了四种结构的热迁移因子、效率因子和时间常数等表达式，搭建了槽式太阳能集热器系统，进行了试验测试和验证。

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Nevertheless, you may also want to introduce the human factor in the equation, so that you can also provide an efficient, easy, and pleasant interaction.

然而，您可能还想将人为的因素考虑进来，从而提供一个有效的、简单的并且舒适的交互作用。

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Between 1975 and 1990 both Labour and total factor productivity actually fell in both industry and services (meaning that businesses became less, not more, efficient).

1975年—1990年之间，劳动力生产力和全要素生产力实际都投入到了工业和服务业(这意味着商业变得越来越缺少效率)。

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In looking to explain Esperance's domestic domination, one factor is their efficient organisational and administrative structure, which is the envy of many Tunisian sides.

BBC: SPORT | Football | African | Esperance rewrite Tunisian football

They are using the unique advancements of the AMD Embedded G-Series APU to develop a brand new generation of highly differentiated, energy-efficient, small form-factor embedded systems that can deliver the vivid visual experience expected in our always-connected world.

ENGADGET: AMD announces Fusion-based Embedded G-Series platform

It could either be due to the foreign nation becoming more efficient in that endeavor or to the domestic nation becoming less efficient, perhaps because of (to name a plausible factor) strangulation by government-backed unions.

FORBES: No President Obama, We Can't "Outcompete" Other Countries